13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 50

TITLE: Mechanical properties of composite resins light-cured using a blue DPSS laser.

AUTHORS: Park JK, Hur B, Kim HI, Kwon YH.

Pusan National University

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S198.

* doi:10.4317/medoral.17643698

http://dx.doi.org/10.4317/medoral.17643698

Abstract

Introduction: Lasers have many favorable features as a light source owing to their monochromaticity and coherence.

Aim of the study: This study examined the mechanical properties of composite resins that were light cured using a diode-pumped solid state (DPSS) laser of 473 nm.

Materials and methods: Eight composite resins were light cured using four different light sources (one quartz-tungsten-halogen (QTH), two light-emitting diodes (LEDs), and one DPSS laser with a wavelength of 473 nm). The light intensity of the DPSS laser and remaining light-curing units were approximately 500 and 900 mW/cm², respectively. The microhardness, flexural properties, and compressive properties were evaluated using the Vickers hardness test, three-point bending test, and compression test, respectively.

Results: In most cases, the microhardness, flexural properties, and compressive properties of the specimens light-cured using the DPSS laser were similar to those obtained using the other light-curing units. Within the limits of the study, the microhardness, flexural modulus, and compressive strength were linearly correlated with the filler content (wt%). The flexural modulus and compressive modulus were also linearly correlated with the microhardness.

Conclusion: Even with a much lower light intensity, the DPSS laser with a wavelength of 473 nm can polymerize composite resins and give comparable mechanical properties to those obtained using the other light-curing units.